External-Cavity-Narrow-Linewidth-Laser

An external cavity narrow linewidth laser is a type of laser that employs an external cavity to enhance the coherence and reduce the linewidth of the laser beam. The external cavity is a Fabry-Perot cavity that consists of a partially reflective mirror and a high-reflectivity mirror. The laser beam is injected into the cavity and undergoes multiple reflections between the mirrors, causing constructive interference and enhancing the coherence of the beam.

The linewidth of a laser beam is a measure of the spectral width of the emitted light. A narrow linewidth laser has a small spectral width, which makes it suitable for applications such as high-resolution spectroscopy, optical communications, and sensing.

The external cavity design allows for precise control of the laser frequency and linewidth by adjusting the distance between the mirrors. This feature makes external cavity narrow linewidth lasers highly versatile and adaptable to different applications.

External cavity narrow linewidth lasers are commonly used in scientific research, metrology, and industrial applications. They offer high stability, precision, and accuracy, making them ideal for demanding applications that require highly coherent light sources.